The leukocytes that are central to adaptive immunity are the____
a. lymphocytes
b. macrophages
c. neutrophils
d. mast cells
e. eosinophils
ANSWER: a
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When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. an induced fit B. a great range of possible catalytic activities C. a greater supply of activation energy D. more permanent binding through intimate total contact E. more possible products of the reaction
Which of the following statements about plant cell walls is NOT true?
A. The cell wall has three layers: the middle lamella, the primary cell wall, and the secondary cell wall. B. In the late stages of cell division the middle lamella is the first cell wall layer to be formed, serving to attach the daughter cells to each other. C. The primary cell wall is thin and flexible, formed while the cells are still growing. D. The secondary cell wall contains complex components such as lignin that are rigid. E. Like the extracellular matrix formed by animal cells, the cell wall polymers are formed in the cytoplasm and secreted to the outside of the cell.
Initially, which of the following isolating mechanisms is likely to have been the most important in preventing gene flow between the two populations of Rhagoletis?
A) Gamete incompatibility B) Temporal isolation C) Mechanical isolation D) Reduced hybrid viability
Peptide bonds are
A) The bonds between amino acids in a protein. B) The bonds between sugars in a carbohydrate. C) The bonds between water molecules. D) The bonds between glycerol and fatty acids in a triglyceride